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Why not Green Threads?Occam claims to offer this. It was a significant language in the '80s, but suffered from lack of development funding and consequently became a research niche only. But its ideas on concurrency are as solid now as they were then and are yet to be improved upon.

Sets Data Structure in GolangI've seen comments by Go authors suggestion that generics are a hoped-for feature, there being a hurdle in the way of needing to work out what the best idomatic pattern should be before committing to extending the language.